This is spun-off from bug 505365.
Bug 505365 is for users who download Firefox from mozilla.com.
This bug is for users who strictly use firefox.rpm from Fedora, only.
Many people have reported they crash using firefox.x86_64.rpm from Fedora, combined with a 64 bit flash plugin from Adobe. At this point I assume this crash is caused by a deficiency in the flash software, but it hasn't been confirmed yet.
The suspicion is based on the fact that many flash sites work (simple videos on the youtube site), only some flash content triggers the crash, like:
http://www.youtube.com/falltvpreview
If you are using a 32 bit firefox.rpm from Fedora with a 32 bit flash plugin, and crash on flash content, please speak up.

I have this problem :
my PC is 32 bit :
[bruno@localhost ~]$ uname -ar
Linux localhost.localdomain 2.6.30.9-96.fc11.i586 #1 SMP Tue Nov 3 23:33:04 EST 2009 i686 athlon i386 GNU/Linux
all the stuff came from fedora/rpmfusion :
[bruno@localhost ~]$ rpm -qa firefox\* xulrunner\* nss\* nspr\*
nss-3.12.4-3.fc11.i586
xulrunner-1.9.1.5-1.fc11.i586
firefox-3.5.5-1.fc11.i586
nss-softokn-freebl-3.12.4-3.fc11.i586
nss_compat_ossl-0.9.5-3.fc11.i586
nss_ldap-264-2.fc11.i586
nss-tools-3.12.4-3.fc11.i586
nss_db-2.2-44.fc11.i586
nspr-4.8.2-1.fc11.i586
Flash was installed from Adobe repository :
[bruno@localhost ~]$ rpm -qa flash\*
flash-plugin-10.0.32.18-release.i386
nspluginwrapper is NOT installed
I don't know if it is important or not : I have a file libflashsupport that was installed with Adobe reader. I don't know if it used with Firefox (I don't know how to know !)
[bruno@localhost ~]$ locate libflash
/opt/Adobe/Reader9/Reader/intellinux/lib/libflashsupport.so
/usr/lib/flash-plugin/libflashplayer.so
/usr/lib/mozilla/plugins/libflashplayer.so
/usr/lib/openoffice.org/basis3.1/program/libflashli.so
As written in the first comment, some flash site work and other crash Firefox.
few times with www.ebay.fr, more often with www.lefigaro.fr
important :
1) I'm French ! It's a long way to have a perfect English !
2) I'm new with bugzilla ! but you can ask me to do things ! as far as I can

I have the same general, but the details differ.
First of all, flash sound works for me (when FF doesn't crash). Then, it religiously crashes on some sites using flash. Emphasis on some. I can access and use YouTube all right, but others cause an immediate crash of XWindow, so that I go back to the kdm/gdm,xdm login screen or to the console.
An example of a site where I crash every time, though sometimes only after a refresh, is http://www.responsa.co.il/default.aspx. I know that most testers will have trouble using it, as it is meant for querying Hebrew texts, but the interface is [available] in English, and since in 99% of cases it crashes immediately, it should be possible to debug without actually using the functions the site offers.
Finally, I noticed some additional weirdness:
* I am using an ATI Radeon 9200SE graphics card. Up until Fedora 10, everything was great; I used the flglx driver. That driver no longer supports my card, so I am now using the radeon driver. All the above problems occur when I use the radeon driver. However, if I configure Xorg to use the vesa driver, Firefox+flash no longer crashes on the problematic web sites. However, that is only a short term solution, as the vesa driver is slow.
* Firefox can grok the flash all right, as it only crashes when the tab with the problematic web site is visible. If I load the tab in the background, FF will load it properly. However, as soon as I select the tab with the problematic web site, the whole house comes down.
I should note that problems started appearing in Fedora 11, when FF would sometimes lock up the screen and keyboard and mouse, necessitating a reboot. However, it was happening more rarely then, so I did not previously file a bug report on that issue. Now, on the other hand, it prevents my normal work.
The files I have installed:
===========================
$ uname -a && rpm -qa firefox\* xulrunner\* nss\* nspr\* flash-plugin\* libflash\*|sort
Linux localhost.localdomain 2.6.31.5-127.fc12.x86_64 #1 SMP Sat Nov 7 21:11:14 EST 2009 x86_64 x86_64 x86_64 GNU/Linux
firefox-3.5.5-1.fc12.x86_64
flash-plugin-10.0.32.18-release.i386
nspr-4.8.2-1.fc12.i686
nspr-4.8.2-1.fc12.x86_64
nss-3.12.4-14.fc12.i686
nss-3.12.4-14.fc12.x86_64
nss_compat_ossl-0.9.5-4.fc12.x86_64
nss_db-2.2-45.fc12.x86_64
nss_ldap-264-8.fc12.x86_64
nss-mdns-0.10-8.fc12.i686
nss-softokn-3.12.4-10.fc12.i686
nss-softokn-3.12.4-10.fc12.x86_64
nss-softokn-freebl-3.12.4-10.fc12.i686
nss-softokn-freebl-3.12.4-10.fc12.x86_64
nss-tools-3.12.4-14.fc12.x86_64
nss-util-3.12.4-8.fc12.i686
nss-util-3.12.4-8.fc12.x86_64
xulrunner-1.9.1.5-1.fc12.x86_64

The problem is solved for me ... it was a strange solution.
I wanted to try firefox from mozilla.org so I installed 3.6. On the first run firefox did its plugin registration/check/whatever. This didn't help so I decided to stay with firefox from fedora and restarted 3.5.8 which did a plugin registration again. Suddenly flash worked with sound.

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